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How can scala make writing multi-threaded programs easier than in java? What can scala do (that java can't) to facilitate taking advantage of multiple processors?
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Scala got a fame for being good for concurrency because it is a functional language and because of its actors library. Functional languages are good for concurrency because they focus on immutability, which helps concurrent algorithms.
A programming language designed to support simultaneous operations. For example, Java and the Java-like Scala language natively support threads and synchronization, whereas languages such as C and C++ rely on external libraries for programming concurrency.
Although Scala is still a language on the rise that has yet to receive the wide-scale adoption of a language such as Java, its support for concurrent programming is rich and powerful.
Scala vs Java performance Some coders claim that Scala is a little bit faster than Java programming with 20% fast processing. Optimization in Scala language makes code compilation much faster than Java coding.
The rules for concurrency are
1 avoid it if you can
2 share nothing if you can
3 share immutable objects if you can
4 be very careful (and lucky)
For rule 2 Scala helps by providing a nicely integrated message passing library out of the box in the form of the actors.
For rule 3 Scala helps to make everything immutable by default.
For rule 4 Scala's flexible syntax allows the creation of internal DSL's making it easier and less wordy to express what you need consicely. i.e. less place for surprises (if done well)
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